WO1992013722A1 - Systeme de positionnement de clavier - Google Patents

Systeme de positionnement de clavier Download PDF

Info

Publication number
WO1992013722A1
WO1992013722A1 PCT/US1992/000824 US9200824W WO9213722A1 WO 1992013722 A1 WO1992013722 A1 WO 1992013722A1 US 9200824 W US9200824 W US 9200824W WO 9213722 A1 WO9213722 A1 WO 9213722A1
Authority
WO
WIPO (PCT)
Prior art keywords
keyboard
operator
recited
positioning system
plane
Prior art date
Application number
PCT/US1992/000824
Other languages
English (en)
Inventor
Frederic C. Ambrose
Original Assignee
Ambrose Frederic C
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24601565&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1992013722(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ambrose Frederic C filed Critical Ambrose Frederic C
Priority to US08/094,109 priority Critical patent/US5405204A/en
Publication of WO1992013722A1 publication Critical patent/WO1992013722A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B21/00—Tables or desks for office equipment, e.g. typewriters, keyboards
    • A47B21/03—Tables or desks for office equipment, e.g. typewriters, keyboards with substantially horizontally extensible or adjustable parts other than drawers, e.g. leaves
    • A47B21/0314—Platforms for supporting office equipment
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B21/00—Tables or desks for office equipment, e.g. typewriters, keyboards
    • A47B21/03—Tables or desks for office equipment, e.g. typewriters, keyboards with substantially horizontally extensible or adjustable parts other than drawers, e.g. leaves
    • A47B21/0371—Platforms for supporting wrists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • B41J5/10—Arrangements of keyboards, e.g. key button disposition
    • B41J5/105—Constructional details of keyboard frames, e.g. adjusting or fixation means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B21/00—Tables or desks for office equipment, e.g. typewriters, keyboards
    • A47B21/03—Tables or desks for office equipment, e.g. typewriters, keyboards with substantially horizontally extensible or adjustable parts other than drawers, e.g. leaves
    • A47B2021/0307—Platforms for supporting office equipment and wrists
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B21/00—Tables or desks for office equipment, e.g. typewriters, keyboards
    • A47B21/03—Tables or desks for office equipment, e.g. typewriters, keyboards with substantially horizontally extensible or adjustable parts other than drawers, e.g. leaves
    • A47B21/0314—Platforms for supporting office equipment
    • A47B2021/0321—Keyboard supports
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B21/00—Tables or desks for office equipment, e.g. typewriters, keyboards
    • A47B21/03—Tables or desks for office equipment, e.g. typewriters, keyboards with substantially horizontally extensible or adjustable parts other than drawers, e.g. leaves
    • A47B21/0314—Platforms for supporting office equipment
    • A47B2021/0321—Keyboard supports
    • A47B2021/0335—Keyboard supports mounted under the worksurface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2217/00—Facilitation of operation; Human engineering
    • H01H2217/028—Facilitation of operation; Human engineering on planes with different or alterable inclination, e.g. convex plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2217/00—Facilitation of operation; Human engineering
    • H01H2217/034—Support for hands or arms

Definitions

  • the medical community has become increasingly aware of an extremely irritating, but non-lethal physical affliction, known generally as the "carpal tunnel" syndrome.
  • the median nerve which extends down the arm and out to the human hand, can be damaged at the point at which it passes through the human wrist joint.
  • the occurrence of this affliction has a large number of unpleasant physical consequences.
  • the affliction is associated with situations in which the hand and wrist are bent upward and backward and, while in that position, significant weight is applied to the wrist. This phenomenon which is very common among serious bicycle riders can result in long term pain and disability.
  • Another object of the invention is the provision of a keyboard positioning system which holds the keyboard in a position in which it is tipped backwards in order to provide a more comfortable and restful orientation for professional or long term keyboard operators.
  • a further objective of the present invention is to provide a keyboard system which supports the operator's hands in a proper position over the keyboard in order to minimize neck and shoulder muscle strain.
  • Another object of the present invention is to provide a keyboard positioning system in which the keyboard can be easily replaced or taken off of its support on runners.
  • Another object of the present invention is to provide a keyboard support that adapts to a wide range of keyboard sizes with minimum need for adjustment.
  • Another object of the present invention is to provide a keyboard support which is easily convertible from a temporary orientation in which ease of installation and mimmum permanent effect on the work station is the priority to a permanent orientation in which maximum effectiveness is the priority.
  • This invention is a keyboard positioning system which allows the keyboard to be positioned so that it is tipped backward.
  • ipped backward is meant that the rear edge, or plane, which is away from the operator, is below the forward edge, or edge closest to the operator.
  • the keyboard positioning system would be provided with a support bar which supports the operator's hands over the keyboard.
  • the bar In the preferred orientation, the bar would be positioned in front of and below the front edge of the keyboard and would engage the large fleshy portion which lies at the base of the palm of the operator's hands, hereinafter proximal palm portion.
  • the ideal is a "neutral" position.
  • the keyboard positioning system may also contain a stabilizing bar between the securing brackets and a tray to hold the keyboard. These elements will help support the keyboard positioning system when typing.
  • the design allows for easy movement on a set of runners in or below a desk.
  • FIG. 1 is a perspective view of the prior art keyboard orientation.
  • FIG. 2 is a perspective view of an embodiment of the present invention.
  • FIG. 3 is another perspective view of an embodiment of the present invention.
  • FIG. 4 is a perspective view of the holding clamp and positioning clamp which would be employed at the far end of the embodiments shown in FIGS. 2 and 3, but without the keyboard in the way.
  • FIG. 5 is a perspective view of the inside view of the system which has the brackets in the embodiments shown in FIGS. 1 and 2.
  • FIG. 6 is a perspective view of a preferred orientation of the system.
  • FIG. 7 is a perspective view of the orientation shown in FIG. 6.
  • FIG. 8 is a figurative view of the preferred orientation of the system and operator's hand.
  • FIG. 9 is a detailed view of a preferred orientation of the palm support.
  • FIG. 10 is a detailed view of another orientation of the palm support.
  • FIG. 11 is a perspective view of a second embodiment of the keyboard system in use.
  • FIG. 12 is a close-up perspective view of the keyboard positioning system and angle adjustment capability.
  • FIG. 13 is a perspective view of a second embodiment of the keyboard positioning system separated from a securing structure.
  • FIG. 14 is a side view of an interchangeable temporary clamp which can be used in the second embodiment.
  • FIG. 15 is a side view of an interchangeable permanent bracket which can be used in the second embodiment.
  • FIG. 16 is a diagramatic side view of a keyboard in a conventional position showing the hand extention necessary to reach the far rows of keys.
  • FIG. 17 is a diagramatic side view of a keyboard oriented to embody the principles of the present invention, showing the ease by which the user can reach the near keys.
  • FIG. 18 is a diagramatic side view of a keyboard oriented to embody the principles of the present invention, showing the ease by which the user can reach the mid keys.
  • FIG. 19 is a diagramatic side view of a keyboard oriented to embody the principles of the present invention, showing the ease by which the user can reach the far keys.
  • the keyboard positioning system generally denominated by the numeral 10, includes a base or desk surface 11, positioning brackets 12 and 29 (not shown) connected to the base 11 , clamping element 13 and 30 (not shown), which is adjustably connected to the positioning brackets 12 and 29, respectively, and a keyboard 14 of the conventional computer keyboard type.
  • the clamping element 13 is shown adjustably locked to the positioning bracket
  • a wing nut and bolt combination 16 and 17 At the forward, or operating edge 18 of the clamping element 13 is a hand support 19 which extends across the front edge 20 of the keyboard and hand support holder 23 which is attached to the clamping element by means of a wing nut 21 and bolt 22.
  • the clamping element 13 has a holding element 24 (set-screw) which holds the keyboard in the clamping element 13.
  • the hands 23 of the operator extend over the wrist support bar and hang downwardly toward the keys 25 of the keyboard 14.
  • the surface 26 of the keyboard is positioned at an angle of approximately 45 * from the horizontal with the rear edge 27 lowered. More specifically, if the keyboard plan is defined as the plane which approximates the upper surfaces of all of the keys, then the preferred embodiment puts the keyboard plan from 30° to 60 "down from the horizontal. The invention appears to be beneficial from 10° to 70° and offers some benefit from 0° to 70° .
  • both of the hands 23 and 28 of the operator carry over the hand support bar and downward toward the keys 25.
  • the inside surface of the clamp 30 is provided with an upper clamping flange 31 and lower clamping flange 32 which oppose one another and engage the side edge of the keyboard.
  • a set screw 33 allows the clamping elements to securing engage the keyboard so that it does not slide out.
  • FIG. 5 shows a view of the inside surface of the clamping system and because it is a side elevational view, the angularity of the clamp with respect to the vertical and horizontal portions of the positioning element can be more clearly seen.
  • FIG. 6 shows a perspective view of the system with the wrist support in the preferred orientation, i.e., below the front edge 20 of the keyboard 14.
  • FIG. 7 is a closer view of the orientation in FIG. 6, showing the operator's hand 23.
  • FIG. 8 is a diagrammatic view of the preferred orientation of the operator's hand 28, the front edge 20 of the keyboard 14 and the hand support 19.
  • the hand support 19 engages and supports the proximal palm 34.
  • the palm 35 curves over
  • FIG. 11 is a perspective view of a second embodiment of this invention in use.
  • FIG. 12 shows the keyboard positioning system 110, shown in FIG. 11, with a downward or backward keyboard slant and tray 142 positioned at the bottom of positioning brackets 143 and 144.
  • the brackets are attached to desk 145.
  • FIG. 13 shows the keyboard positioning system with hand support 19 attached by means of adjustment knobs 150 and 151 to tray 142 which holds a keyboard (not shown).
  • the tray 142 is attached by height adjustment knobs 153 and 154 (not shown) on both the left and right sides of two positioning brackets 143 and 144.
  • the positioning brackets may be connected to a pair of runners 154 and 155 which are connectable to a desk 145 (not shown).
  • a support bar 146 is positioned between the positioning brackets 143 and 144 , to make the entire structure very rigid.
  • the positioning brackets 143 and 144 have knobs 152 and 153 which screw into the tray 142 and which allow for height and angle adjustment by slots 157 and 158 in each of the positioning brackets 143 and 144, respectively.
  • One special feature of the second embodiment is the means by which the system is attached to the desk. It has been found that the long-term benefits of the present invention can be best accomplished by maximizing the rigidity of the system as it is attached to a desk. However, the rigid and permanent installation tends to be time consuming and tends to leave permanent disfigurement (i.e., screw holes) in the underside of the desk. It has been found that these aspects of the permanent installation tend to discourage many potential users from trying the system and receiving its benefits.
  • This embodiment is, therefore, provided with easily interchangeable clamps which allow the system to be quickly and easily attached to a desk for test use. The clamps do not require damage to the desk. In that way, the user can test the system with minimum objection and thereby discover its benefits.
  • FIG. 14 shows a side view of the attachment portion of the system.
  • the positioning bracket 144 is rigidly attached to the clamp 162 by a threaded bolt 161, which passes through an aperture in the bracket 144 and engages a threaded aperture in the clamp 162.
  • the clamp 162 has an upper arm 164 which engages the upper surface of the desk 145.
  • the clamp also has a lower arm 165 which extends a substantial distance under the desk 145.
  • the lower arm has a threaded vertical bore which carries a threaded shaft 166.
  • the lower end of the shaft 166 has a clamping knob 167, which, when turned, allows the upper end of the shaft 166 and a pad 163 thereon to engage or disengage the lower surface of the desk.
  • This clamp 162 and a similar clamp 168 (not shown) on the other bracket 143 allow the system to be easily and quickly attached to the desk for test purposes.
  • the clamp 162 is separated from the bracket 144 by removing the bolt 161.
  • the bracket 144 is then attached to the runner or bolt-on bracket 155 using the bolt 161.
  • the bolt passes through the aperture in the bracket 144, through an aperture in the bolt-on bracket 155, and engages a threaded bore in the end of the stabilizing bar 146.
  • Bolt-on brackets 154 and 155 for each of the brackets 143 and 144.
  • the bolt-on brackets are mirror images of one another.
  • Bolt-on bracket 155 consists of an elongated frame 171, several flanges (only flange 172 is shown in FIG. 15) which allow the frame to be rigidly bolted to the underside of the desk 145, and a slider 175.
  • the slider is elongated and is slidably mounted in ball-bearings, for horizontal linear movement, in the frame 171.
  • One end of the slider 175 is the part of the bolt-on bracket 155 which is attached to the bracket 144.
  • the sliding action of the bolt-on brackets allows the system to easily move the keyboard from a working position away from the desk to a storage position near and beneath the desk.
  • the present invention does something no other prior art product can do and that is to place and maintain the hand and wrist of the operator at or near a physiologically neutral position.
  • the emphasis on the neutral position is critical because this is the position which really helps dedicated (full-time) keyboard users to minimize the damage caused by the bending of the median nerve and associated wrist structures.
  • the present invention uses of the sliders, in combination with a very thin holding tray, allows for the computer keyboard to be pulled up into the operator's
  • the adjustable palm bar with its unique small diameter (3/4" to 1-1/8" in outer diameter, preferably 7/8"), allows for minute adjustments of the wrist position in relationship to the keys and for the overall comfort of the hand as it is placed over the computer keyboard.
  • the backward-tilt holding tray for the computer keyboard helps to dramatically reduce the amount of flexing the fingers must do while operating the keyboard.
  • keyboard orientation is the manner in which the position of the palm rest and the back-tilted orientation of the keyboard allows the fingers to reach the most-used keys with a maximum of hand and finger flexion
  • the conventional keyboard orientation requires that a hand position which allows contact with the first row of keys also must involve extreme extension of the fingers to reach the upper row of the main keys. This extension of the fingers
  • the present invention allows reaching the keys while keeping the fingers in flexure. .FIGS. 17-19 show this effect graphically.
  • the present invention is the first device to be totally adjustable to all operators.
  • the height and keyboard angle can be quickly and easily adjusted by the tightening knobs.
  • the present invention has overall ability to address the unique physiological requirements of any operator, regardless of size. It allows for the correct straight up-and-down sitting posture for the back, at the same time, adding
  • the present invention while appearing similar in some respect to prior art products in the computer keyboard storage tray market, is radically different.
  • the present invention is designed for one primary function and that is to provide a device to respond to the computer keyboard operator's physical needs. Primarily, this is accomplished by placing the operator's wrists in a continuous neutral position while the operator continues to operate the keyboard. This is achieved by three physical aspects, (1) combining a backward tilted holding tray with (2) a moveable approximately 3/4" diameter round palm rest, and (3) attached to computer tray sliders. The ability of the three movable aspects to be minutely adjusted to the operator's own physical requirements maximizes the benefit.
  • the present invention develops a new aspect in the ergonomic field with regards to accepted sitting positions for keyboarding. It is generally accepted that the
  • the present invention is particularly effective when the hand and arm are positioned at a downward angle of 110 degrees down to 160 degrees relative to the vertical upper arm. No other product has advocated using this extreme position. In field trials, the present invention has won the praise of its operators. The present invention is proving to be innovative in bringing relief with this new, radical position.
  • the critical position for the operator to maintain while operating the computer keyboard is a position which causes the wrist to remain in neutral position and reduces the repetitive extension (dorsal bending back) of the wrist.
  • the present invention does this, but the prior art products do not enforce the optimum position of the hand and arm so that the wrist remains neutral throughout the operation of the computer keyboard.
  • the prior art wrist rests serve as support for the wrist, rather than the palm. The whole wrist must be placed on the prior art support tray.
  • present invention requires only the distal surface of the base part of the palm to rest on the small diameter round bar.
  • the fatty tissue in the palm allows for a natural cushion.
  • the prior art units require the wrist, with its veins and tendons close to the skin surface, to be in constant and potentially damaging contact with the wrist rest.
  • the palm rest allows for greater movement of the hand with less obstruction from the supporting surface of the hand support.
  • the whole wrist is in contact with the supporting surfaces.
  • the present invention only requires contact between the support and the base of the operator's palms. This allows for a more natural movement of the fingers and hands, reducing stress and fatigue to the operator.
  • Vibration is an important aspect to consider when operating the computer keyboard on a continuous basis. It is analogous to being in a rough riding car versus a smooth riding car. For the dedicated keyboard operator, it is important for the keyboard to provide a firm, energy absorbing or "damped" surface. If this is not
  • the present invention has carefully taken into account the need to provide the
  • the present invention is designed much as an athlete's apparatus for a sport would be designed. It must do the job and hold up under duress and provide maximum comfort to the users. An operator who is subject to hand support vibration while using a computer keyboard for extended periods of time, will suffer quickly from fatigue and this may result in the injuries now being experienced in the work place. While the present invention provides for the maximum comfort of the operator, the device is primarily intended to encourage the optimum position for the computer keyboard operator and that is the
  • the present invention's concept of comfort for the operator includes the long-term comfort which results from the design function of having the computer keyboard operator maintain this neutral, and therefore less injurious, hand and wrist posture.
  • the other prior art products do not recognize this specific mode of operation. It is only maximally achievable with the special
  • the present invention also focuses on the "palm only" resting on the palm support.
  • the prior art units show or describe the whole wrist resting on the wrist rest.
  • the wrist In order for the operation of the prior art units, the wrist must be moved continuously over the surface to reach the keys. That does not allow for the wrist and hand to be placed in a continuous neutral position.
  • the fingers must be extended (bent dorsally) for each key stroke of operation.
  • the present invention allows for the fingers to be moved in a non-stress downward movement, without significant need for full extension (dorsal bending) of the fingers.
  • An important aspect of the key stroke operation on the backward tilted keyboard is the ability to keep the hand in a semi-cupped position. This allows for the hand to work without being forced to reach, in extension, for the computer keyboard keys. This, incidentally, adds to the speed of the operator's typing ability, because the fingers have less range to travel in the stroking of the keys. Over a short period of time, this adds to the productivity of the operator with much less fatigue.
  • the present invention while somewhat similar in overt appearance to some prior art units, is uniquely different from any other prior art product.
  • the present invention is designed to address the dedicated (full-time) keyboard user's physical need for ergonomic adjustment while operating the computer keyboard. No other product has

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

Système de positionnement de clavier (10) dans lequel le bord arrière (27) dudit clavier (14) est situé sensiblement plus bas que son bord avant ou bord opérationnel (20), de façon que le plan formé par la main de l'utilisateur soit parallèle ou situé au-dessous de la ligne formée par son avant-bras, afin de limiter l'éventualité d'un syndrome du tunnel carpien. Une barre de support pour la main (19) sert d'appui pour les mains de l'utilisateur du clavier.
PCT/US1992/000824 1991-02-01 1992-02-03 Systeme de positionnement de clavier WO1992013722A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/094,109 US5405204A (en) 1992-02-03 1992-02-03 Keyboard positioning system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64862891A 1991-02-01 1991-02-01
US648,628 1991-02-01

Publications (1)

Publication Number Publication Date
WO1992013722A1 true WO1992013722A1 (fr) 1992-08-20

Family

ID=24601565

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/000824 WO1992013722A1 (fr) 1991-02-01 1992-02-03 Systeme de positionnement de clavier

Country Status (4)

Country Link
US (2) US5567067A (fr)
AU (1) AU1339992A (fr)
CA (1) CA2101434A1 (fr)
WO (1) WO1992013722A1 (fr)

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US5582375A (en) * 1992-04-20 1996-12-10 Martin; Michael Adjustable ergonomic support for computer keyboards
EP0746528A1 (fr) * 1994-03-03 1996-12-11 Mead-Hatcher, Inc. Support de poignets/clavier a positionnement neutre
FR2736188A1 (fr) * 1995-06-30 1997-01-03 Schneider Electric Sa Pupitre de commande bimanuelle
US5885017A (en) * 1996-04-16 1999-03-23 Gtech Corporation Adjustable keyboard assembly
US6148739A (en) * 1992-04-20 2000-11-21 1320236 Ontario Inc. Adjustable ergonomic support for computer keyboards
EP3191762A4 (fr) * 2014-09-11 2018-07-11 Thermogenesis Group, Inc. Clavier ergonomique et système de positionnement de périphérique

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US5704299A (en) * 1996-04-05 1998-01-06 Haworth, Inc. Keyboard support
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WO2000048065A2 (fr) * 1999-02-11 2000-08-17 Sheppard Robert J Support de poignet pour clavier
CA2260401A1 (fr) * 1999-02-15 2000-03-21 Gilles Bernard Barre de pratique
US6161805A (en) * 1999-04-29 2000-12-19 Wells; John C. Ergonomic hand rest for gaming machine
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US6682240B1 (en) * 2003-02-24 2004-01-27 Behavior Tech Computer Corporation Self-positioning device for a keyboard
US7002067B2 (en) * 2003-08-05 2006-02-21 Teel Kenneth A Wrist position training assembly
US7113393B2 (en) * 2003-11-18 2006-09-26 3M Innovative Properties Company Adjustable keyboard support assembly
US6938866B2 (en) * 2003-11-18 2005-09-06 3M Innovative Properties Company Adjustable keyboard support assembly method of use
US7108234B2 (en) * 2004-04-06 2006-09-19 Ritchey Eugene B Keyboard support device and method
US7169086B2 (en) * 2005-03-29 2007-01-30 Gail Michelson Wrist trainer for piano instruction
US20060291946A1 (en) * 2005-06-24 2006-12-28 Microsoft Corporation Ergonomic apparatus for keyboard

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AU1339992A (en) 1992-09-07
US5709489A (en) 1998-01-20
US5567067A (en) 1996-10-22
CA2101434A1 (fr) 1992-08-02

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